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  • NGINX load balancer DOS itself

    - by cjaredrun
    I have been running a load balancing machine for a number of months now which has had no problems in the past. I got woken up to some downtime and I am seeing this a lot in syslog: TCP: Possible SYN flooding on port 80. Sending cookies. At which point Nginx takes up 100% of the cpu and doesn't come back down to normal for several minutes. I have it running on Ubuntu currently but I also was able to replicate on Debian 6.

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  • What's the best way to rewrite traffic from domainA.com/foo to domainB.com/bar while properly rewrit

    - by Chad DePue
    We have a number of sites that have blogs, like domainA.com/blog domainB.com/blog and we host the blogs on wordpress multi user: our-separate-wordpress-site.com/domaina_blog our-separate-wordpress-site.com/domainb_blog for SEO reasons we really, really want domainA.com/blog to be the blog url, not the other path. But we don't see any examples where this is done, because we need not to just rewrite the traffic, but cookies as well... is this possible with a webserver or a reverse proxy?

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  • iTunes 9 not sorting albums by track order consistently

    - by joshhunt
    I have my iTunes library set to sort by music by Artist, then album (). For most of my albums this will also sort the albums in the correct track listing order (using the track number tag). Except for one album: As you can see, "The Boy Who Knew Too Much" seems to sort erratically. Why is this happening and how can I fix it?

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  • Text expansion software for Windows

    - by MagicAndi
    I am interested in using a text expansion application, such as Texter or Phase Express. Does anyone have any recommendations for the best text expansion application to use? I work on a number of Windows PCs (XP, Vista, Windows Server 2003 and Windows Server 2008); the application would need to work on all of these OS flavours. I am particularly interested in an application that is available for all of my programs, and that isn't program specific.

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  • Two dimensional virtual desktop space in Ubuntu

    - by Herms
    Is there any way to create a 2-dimensional virtual desktop space in Ubuntu? The only control I'm seeing is the number of virtual desktops, but they seem to only go in a line. I'm used to having a 2-dimensional space (so I can go up/down/left/right instead of just left/right), and I'd really like to have that in ubuntu as well.

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  • apache log analysis tools for multiple virtual hosts?

    - by shreddd
    I am interested in trying to get a side by side usage comparison of all the virtual hosts being served up by my apache server. In the simplest case, I want to see a list (or bar chart) with each virtual host and the number of requests/traffic on that site. I've been playing around with webalyzer and awstats but I haven't been able to compare multiple virtual hosts in the same infographic. Anyone have any suggestions on tools for doing this (or how I might use the above tools to do so)?

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  • How do I change a VMWare 1.x server's guest boot order?

    - by bo gusman
    I have 4 VMs on a Linux host, call them A, B, C, D running on Z. I really don't care when A and B come up, but I would like to make sure that D comes up before C. I believe that in VMWare 2.x it's possible to change the boot order. Is this possible in 1.x as well? Is this done in /etc/vmware/vm-list? I see that there are a number of VMs listed there, including some that have long since been deleted.

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  • Compare 2 sets of data in Excel and returning a value when multiple columns match

    - by Susan C
    I have a data set for employees that contains name and 3 attributes (job function, job grade and location). I then have a data set for open positions that contains the requisition number and 3 attributes (job function, job grade and job location). For every employee, i would like the three attributes associated with them compared to the same three attributes of the open positions and have the cooresponding requisition numbers displayed for each employee where there is a match.

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  • iptables : how to correctly allow incoming and outgoing traffic for certain ports?

    - by Rubytastic
    Im trying to get incoming and outgoing traffic to be enabled on specific ports, because I block everything at the end of the iptables rules. INPUT and FORWARD reject. What would be the appropiate way to open certain ports for all traffic incoming and outgoing? From docs I found below but one has to really define both lines? iptables -A INPUT -i eth0 -p tcp --dport 22 -m state --state NEW,ESTABLISHED -j ACCEPT iptables -A OUTPUT -o eth0 -p tcp --sport 22 -m state --state ESTABLISHED -j ACCEPT I try to open ports for xmpp service and some other deamons running on server. Rules: *filter # Allow all loopback (lo0) traffic and drop all traffic to 127/8 that doesn't use lo0 -A INPUT -i lo -j ACCEPT -A INPUT -d 127.0.0.0/8 -j REJECT # Accept all established inbound connections -A INPUT -m state --state ESTABLISHED,RELATED -j ACCEPT # Allow all outbound traffic - you can modify this to only allow certain traffic -A OUTPUT -j ACCEPT # Allow HTTP # Prevent DDOS attacks (http://blog.bodhizazen.net/linux/prevent-dos-with-iptables/) # Disallow HTTPS -A INPUT -p tcp --dport 80 -m state --state NEW -m limit --limit 50/minute --limit-burst 200 -j ACCEPT -A INPUT -m state --state RELATED,ESTABLISHED -m limit --limit 50/second --limit-burst 50 -j ACCEPT -A INPUT -p tcp --dport 443 -j DROP # Allow SSH connections # The -dport number should be the same port number you set in sshd_config -A INPUT -p tcp -s <myip> --dport ssh -j ACCEPT -A INPUT -p tcp -s <myip> --dport 5984 -j ACCEPT -A INPUT -p tcp --dport ssh -j REJECT # Attempt to block portscans # Anyone who tried to portscan us is locked out for an entire day. -A INPUT -m recent --name portscan --rcheck --seconds 86400 -j DROP -A FORWARD -m recent --name portscan --rcheck --seconds 86400 -j DROP # Once the day has passed, remove them from the portscan list -A INPUT -m recent --name portscan --remove -A FORWARD -m recent --name portscan --remove # These rules add scanners to the portscan list, and log the attempt. -A INPUT -p tcp -m tcp --dport 139 -m recent --name portscan --set -j LOG --log-prefix "Portscan:" -A INPUT -p tcp -m tcp --dport 139 -m recent --name portscan --set -j DROP -A FORWARD -p tcp -m tcp --dport 139 -m recent --name portscan --set -j LOG --log-prefix "Portscan:" -A FORWARD -p tcp -m tcp --dport 139 -m recent --name portscan --set -j DROP # Stop smurf attacks -A INPUT -p icmp -m icmp --icmp-type address-mask-request -j DROP -A INPUT -p icmp -m icmp --icmp-type timestamp-request -j DROP -A INPUT -p icmp -m icmp -j DROP # Drop excessive RST packets to avoid smurf attacks -A INPUT -p tcp -m tcp --tcp-flags RST RST -m limit --limit 2/second --limit-burst 2 -j ACCEPT # Don't allow pings through -A INPUT -p icmp -m icmp --icmp-type 8 -j DROP # Log iptables denied calls -A INPUT -m limit --limit 5/min -j LOG --log-prefix "iptables denied: " --log-level 7 # Reject all other inbound - default deny unless explicitly allowed policy -A INPUT -j REJECT -A FORWARD -j REJECT COMMIT

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  • Under what circumstances would a junction point be more appropriate than a symbolic link?

    - by Benjamin Pollack
    Symbolic links were introduced an incredibly long time ago in Windows, yet I still encounter a large number of systems that use junction points. I know that symbolic links afford functionality not in junction points (e.g., they work on external drives); my question is whether there is functionality specific to junction points that make them more appropriate than symbolic links in some circumstances.

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  • How to use DNS to redirect domain to specific port on my server

    - by Tomaszs
    I'm running a web server on port 80 and another on port 87. I would like to use DNS so that www.example.com goes to port 87. How can I accomplish this using DNS only? Canonical Question: This question was originally asking about running IIS and Apache on the same server, but the same concepts can be applied to any server software receiving connections from clients. The Answers below describe the technical problems with using DNS to assign a port number for a client to connect.

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  • Is there a lifespan for a dvd rom drive?

    - by Nrew
    Specifically a liteon dvd multi recorder. Which can burn and read dvd's. Is there a specific number of burns which you can use? And after that, the burner will no longer work? Do you know of any useful tips on how to have a longer dvd rom lifespan?If it has really a lifespan.

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  • Differences between how OS X Snow Leopard and Lion interface with a proxy?

    - by Antoni
    We have a proxy at school, which requires a login/password, and blocks a certain number of sites that aren't "school related" (facebook, youtube, etc.) While I'm able to get through to most things, people who've upgraded to Lion can't get through to anything, even though I've replicated my proxy/network settings on their machines. Is it possible that the difference in OS versions is causing this? I have Snow Leopard, they have Lion.

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  • Make Emacs status bar draggable anywhere?

    - by Ken
    In Emacs, if I split the frame (C-x 2), each window has a status bar. Historically, I could drag the status bar to resize them. Unfortunately, with Emacs these days and just a few modes (for version control, line/col number, abbrevs, my programming language, etc.), pretty much the entire bar has remapped mouse-1 to something other than letting me drag the bar! Is there any way to turn the status bar back into something I can drag, without losing all of my modes?

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  • image filter that spits out pi

    - by patrickinmpls
    I've seen this before but I forgot what's its called. Does anyone know of software that takes a picture and spits out an image of the number pi, ie. 3.14... not the symbol? It basically kinda looks like ascii art but the numbers are different shades of gray so it is like a black and white photo. Thanks!

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  • How to find all occurences of an email address on a website

    - by thomasrutter
    Let's say I have a large website which may have a number of email addresses on it that are getting picked up by spammers. I plan to obfuscate or remove them all. What's the easiest way to crawl my website to find any email addresses I may be exposing? Either through on-page text (which Google can pick up, but not very well) or mailto: links (which Google can't).

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  • how to generate random numbers under OpenWRT?

    - by user62367
    With a "normal" (i mean "full") linux distro, it works just fine: sleep $(echo "$[ ($RANDOM % 10 ) ]") ok, it waits for about 0-9 sec but under OpenWRT [not using bash, rather "ash"]: $ sleep $(echo "$[ ($RANDOM % 9 ) ]") sleep: invalid number '$[' $ and why: $ echo "$[ ($RANDOM % 9 ) ]" $[ ( % 9 ) ] $ So does anyone has a way to generate random numbers under OpenWRT, so i can put it in the "sleep"? Thank you

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  • SQL Clustering on Hyper V - is a cluster within a cluster a benefit.

    - by Chris W
    This is a re-hash of a question I asked a while back - after a consultant has come in firing ideas in to other teams in the department the whole issue has been raised again hence I'm looking for more detailed answers. We're intending to set-up a multi-instance SQL Cluster across a number of physical blades which will run a variety of different systems across each SQL instance. In general use there will be one virtual SQL instance running on each VM host. Again, in general operation each VM host will run on a dedicated underlying blade. The set-up should give us lots of flexibility for maintenance of any individual VM or underlying blade with all the SQL instances able to fail over as required. My original plan had been to do the following: Install 2008 R2 on each blade Add Hyper V to each blade Install a 2008 R2 VM to each blade Within the VMs - create a failover cluster and then install SQL Server clustering. The consultant has suggested that we instead do the following: Install 2008 R2 on each blade Add Hyper V to each blade Install a 2008 R2 VM to each blade Create a cluster on the HOST machines which will host all the VMs. Within the VMs - create a failover cluster and then install SQL Server clustering. The big difference is the addition of step 4 whereby we cluster all of the guest VMs as well. The argument is that it improves maintenance further since we have no ties at all between the SQL cluster and physical hardware. We can in theory live migrate the guest VMs around the hosts without affecting the SQL cluster at all so we for routine maintenance physical blades we move the SQL cluster around without interruption and without needing to failover. It sounds like a nice idea but I've not come across anything on the internet where people say they've done this and it works OK. Can I actually do the live migrations of the guests without the SQL Cluster hosted within them getting upset? Does anyone have any experience of this set up, good or bad? Are there some pros and cons that I've not considered? I appreciate that mirroring is also a valuable option to consider - in this case we're favouring clustering since it will do the whole of each instance and we have a good number of databases. Some DBs are for lumbering 3rd party systems that may not even work kindly with mirroring (and my understanding of clustering is that fail overs are completely transparent to the clients). Thanks.

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  • Raid1 with active and spare partition

    - by Daniel Baron
    I am having the following problem with a RAID1 software raid partition on my Ubuntu system (10.04 LTS, 2.6.32-24-server in case it matters). One of my disks (sdb5) reported I/O errors and was therefore marked faulty in the array. The array was then degraded with one active device. Hence, I replaced the harddisk, cloned the partition table and added all new partitions to my raid arrays. After syncing all partitions ended up fine, having 2 active devices - except one of them. The partition which reported the faulty disk before, however, did not include the new partition as an active device but as a spare disk: md3 : active raid1 sdb5[2] sda5[1] 4881344 blocks [2/1] [_U] A detailed look reveals: root@server:~# mdadm --detail /dev/md3 [...] Number Major Minor RaidDevice State 2 8 21 0 spare rebuilding /dev/sdb5 1 8 5 1 active sync /dev/sda5 So here is the question: How do I tell my raid to turn the spare disk into an active one? And why has it been added as a spare device? Recreating or reassembling the array is not an option, because it is my root partition. And I can not find any hints to that subject in the Software Raid HOWTO. Any help would be appreciated. Current Solution I found a solution to my problem, but I am not sure that this is the actual way to do it. Having a closer look at my raid I found that sdb5 was always listed as a spare device: mdadm --examine /dev/sdb5 [...] Number Major Minor RaidDevice State this 2 8 21 2 spare /dev/sdb5 0 0 0 0 0 removed 1 1 8 5 1 active sync /dev/sda5 2 2 8 21 2 spare /dev/sdb5 so readding the device sdb5 to the array md3 always ended up in adding the device as a spare. Finally I just recreated the array mdadm --create /dev/md3 --level=1 -n2 -x0 /dev/sda5 /dev/sdb5 which worked. But the question remains open for me: Is there a better way to manipulate the summaries in the superblock and to tell the array to turn sdb5 from a spare disk to an active disk? I am still curious for an answer.

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  • LPR on Windows: Can you specify # of copies?

    - by Bill
    In Linux, you can use lpr -#5 foo.txt to get 5 copies of a document when sending to an LPD-based print server. The Windows (XP, 2003, 2008) version of LPR supplied by MS doesn't seem to have this option, though. Does anyone know if there's a hidden option to specify the number of copies? Thanks.

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  • Shoretel Reporting Question

    - by MJ
    This might be a bit off topic, but I'll ask anyways. With Shoretel reports, the report that generates how long someone is on the phone(actively talking on the phone), if they are listed as "off hook", like right before you dial a number, does that still show up as being on a call?

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